add roleBytes utility for contract role usage

Author: dirtycajunrice

packages/thirdweb/src/utils/encoding/helpers/role-bytes.ts

@@ -0,0 +1,20 @@
+import { type Hex, isHex } from "../hex.js";
+
+/**
+ * Calculates the byte size of a Hex string or Uint8Array.
+ * If the value is a Hex string, it accounts for the leading "0x" prefix.
+ * @param value The Hex string or Uint8Array.
+ * @returns The byte size of the value.
+ * @example
+ * ```ts
+ * import { byteSize } from "thirdweb/utils";
+ * const size = byteSize("0x1a4");
+ * console.log(size); // 2
+ * ```
+ */
+export function byteSize(value: Hex | Uint8Array) {
+  if (isHex(value, { strict: false })) {
+    return Math.ceil((value.length - 2) / 2);
+  }
+  return value.length;
+}